Main equipment selection of artificial sand production line

Main equipment selection of artificial sand production line

Main Equipment Selection and Eight Design Points of Artificial Sand Production Line

At present, with the continuous emergence of infrastructure projects, machine-made sand production is in full swing across the country. Faced with the demand of gravel market and the increasingly stringent environmental supervision, it is very important to do a good job in equipment selection and the efficient and environmentally friendly design of production lines. This article takes the semi-dry sand making process as an example, for everyone to talk about the equipment selection and process design points in the system sand production line for reference.

First, the main equipment selection

Crude broken equipment selection

The coarse-breaking equipment used for aggregate production is generally a gyratory crusher, jaw crusher and impact crusher. If the production capacity is required to be higher than 1000t/h, it is recommended to use a gyration.

Medium fine-breaking equipment selection

Medium-breaking equipment generally has a cone crusher and impact crusher to choose from, sand making machine is often used in the final level of sand making and shaping. The cone crusher is mainly suitable for crushing rocks with high hardness and high abrasive index, and the product has less powdery material. Impact crusher is mainly suitable for crushing rock with moderate or low abrasive index, and has more powdery material. If the demand for powdered material is poor, a standard cone crusher can be used for the middle smash and a short-head cone crusher for the fines.

artificial sand production line artificial sand production line

Screening equipment selection

Stone screening equipment generally uses a linear shaker or a circular shaker. Linear vibrating screen processing capacity is small, suitable for small particle size screening, small production use, can be used for water filter. Circular vibrating screen has high efficiency and large processing capacity. It is suitable for large-size particle size screening and large-scale production. When the circular vibrating screen is equipped with a pressure water spraying system, it can be used as a stone washing equipment. By means of hydraulic washing, the stones are tumbling and vibrating on the screen surface, and it is easier to wash away the fine mud adhering to the surface. For 0-4.75mm products in the mud and stone powder can generally choose spiral sand washing machine or bucket wheel washing machine after washing to obtain machine-made sand.

Wastewater and mud processing equipment selection

The mud-containing wastewater after washing the gravel aggregates needs to be treated in order to achieve zero discharge of wastewater from the production line. After examining the wastewater treatment equipment, a system consisting of a cyclone unit, a thickener and a filter press was selected to treat the waste water and mud, which can avoid the direct discharge of muddy wastewater into the sedimentation tank, resulting in a large area. The disadvantage of the sedimentation tank is difficult to clean.

Second, the production line design points

Set intermediate material sheds

The intermediate material stack can adjust the overall system capacity of the aggregate production line. When the rough section is overhauled, the downstream aggregate-made section will not stop production. When the mine can only be produced in whiteshift production, the downstream aggregate-making section can still be produced in two shifts, and the number of equipment can be reduced. Through the production class system adjustment system production capacity, reduced investment, to play the advantages of the system equipment.

Make full use of terrain height difference

Any design of the production line is a very good design if it can minimize construction investment and operating costs. Adapting to local conditions and making full use of topographical elevations for process planning can not only reduce civil investment and equipment investment, but also reduce production and operating costs.

Fine pre-screening design before the break. If the raw material contains clay, it is generally difficult to remove it by sieving. Designing pre-screening not only screens out soil-containing wastes smaller than a certain particle size by sieving when the raw material has a high soil content, but also allows aggregates smaller than the required particle size to pass through the medium and fine-break , And then increase the system yield and reduce the production of powdered material.

The finished product sieve is sprayed with a single layer shaker. The purpose of the first-order vibrating screen spray for the semi-dry sand aggregate production line is to remove part of the soil and to make the materials that are difficult to wash clean as early as possible, so that the mud-containing material can be soaked in advance. The secondary and tertiary finished vibrating screens are designed as a single layer, and the purpose of spray washing is to make each material product have the opportunity of direct contact with fresh water, thereby improving the cleanliness of aggregate products.

Sand stone washing system

For sludge-containing wastewater, due to the large amount of mud sand and large particle size, it is not suitable to use the slurry pump to convey, and it can only flow through the water tank to the sand washing machine. In this link, the distance of the flow of the waste water and the angle of the sink should be fully considered. The sand washer workshop should be placed on the lower stage of the shaker workshop as much as possible. The trough is made into a U-shaped groove to reduce friction. A filter screen should be installed at the outlet of the sand washer and the outlet of the cyclone unit to prevent the moisture content of the material entering the finished product yard from being too large and affecting product sales.

Waste cement processing system

After the sand-washed sludge-containing waste water enters the condensate pool, the position of the dosing point should be reasonable, and the dosing amount should be appropriate to improve the effect of the thickener system. Before the filter press should be set to buffer the mixing pool to meet the concentrator after the continuous operation of the slurry pump and press filter intermittent work requirements. The choice of filter press capacity must fully consider the time required for each job and the moisture content of the cake.

Product storage and shipping

The design point of this link is to set at least one or two sets of weighing scales in addition to the appropriate discharge equipment for each batch, in order to adjust the reasonable gradation of sandstone, to meet the needs of customers for different grades of sand aggregate.

Environmental protection

Dust and dust collection measures

In the design, we generally adopt a policy of prevention and prevention. The dust points should be reduced as much as possible in each process before the middle and fine crushing, and the well-sealed conveying and feeding equipment should be used. Careful attention should be paid to the shape, angle, etc. of the material pipe connected to the equipment, and the drop should be minimized. All dust emission points adopt high efficient dust collectors with high dust collection efficiency and reliable technology to ensure that dust emission concentrations are lower than national standards. The storage of intermediate materials and soil-containing wastes uses closed sheds and spray dust removal to reduce the impact of dust on the surrounding environment.

Noise control

Control of noise Select equipment with low noise as much as possible from the equipment selection, and arrange the noise source equipment in a closed factory building and green outside the workshop to block the noise transmission.

Wastewater treatment and mud discharge

The wastewater is mainly domestic wastewater and sand washing wastewater. After the domestic wastewater is treated with pretreatment and other waste water is transferred to the wastewater treatment plant of the plant, it can be reused for the production line after reaching the standard. The wastewater generated by the screening and washing is treated with sand and water and processed by the waste cement processing system and recycled as production water. The mud cake after sludge treatment and the waste soil produced by the pre-screening are used for the reclamation of the cushion in the mine to achieve zero discharge of waste water and mud. This article mainly introduces the equipment selection and design points of the semi-dry sand production line. In the actual production, the sand aggregate production process and equipment configuration are various. The specific design should be adapted to local conditions and tailored to the production requirements.

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